Process of feeding fine fuel.



UNITED STATES PATENT OFFICE.

' ROLLA C. CARPENTER, OF ITHACA,- NEW YORIQASSIGNOR TO A'IYLAS PORT- LAND CEMENT COMPANY, A CORPORATION OF PENNSYLVANIA.

PROCESS OF FEEDING FIN'E FUEL.

SPECIFICATION forming part of Iiettrs Patent N0. 691,336, dated JanuaryvlfJ-r, 1902.

` Application iled August 7, 1901i` Serial No. 71,172. (No specimens.)

To @ZZ whom it may concern: Y

Be it known that I, RoLLA C. CARPENTER, a citizen of the United States, anda resident lof Ithaca, in the county of Tompkins and 5 State of New York, havey invented anew and useful Process for FeedingFine Fuel,of which vthis is a specification, taken inconnection with the accompanying drawings, in which the same reference characters refer to similar io parts in the several figures.

Such of my inventions as are disclosed, but

- not claimed, in this application are claimedin my divisional application, Serial No."79,319, filed October 21, 1901.

I5 My invention relates generally to theL method of burning pulverized fuel, more particularly adapted to the roasting of cement material in rotary furnaces, in which a jet of `air containing pulverized'carbonaceous fuel zo and the heated gases resulting from the combustion of `such fuel pass up through the fur. .y

nace as an axial core and heat the walls of -the furnace by radiation in the manner indi` cated in the patent to Hurry and Seaman, 25 No. 645,031, of March 6,1900. My invention relates specifically to an improved method by which an air-jet initially of larger diameter and of lower pressure thauthat indicated as` the preferred form of jet in the said patent may be successfully employed to heat these rotary furnaces.

Figurel shows a side elevation of a rotary furnace to which the apparatus forcarrying out my new process has been applied, parts being shown in section. Fig. 2 is an end view of part of this device, portions being omitted to more clearly indicate the construction.

Fig. 3 is a partial sectional plan view taken substantially along the axis of the furnace.

ao'Figs. 4 and 5 are details of a modified form' chamber.

driving apparatus C', which-serves to slowly rotate'thle furnace in the direction indicated -by the arrow.A (See Figzl.) The furnace is slightly inclined, asis shown in the drawings, 55 to insurev the lproper feed of the cementmaterial through it, and thevupper end of the furnace projects into a vertical chamber'B, which has suitable connection with a stack C through au archu'ay 'or opening C2 in the 6o The chamber is formed lwith two openings closed by doors or covers BBS, serving to permit access to the chamber for y cleaning and also for inspection of the interior of the furnace. The conduit for thecement 65 material, which may be protected by a waterjacket," if'desired, extends through the chain-,h

f'berB and into the upperend of t-he rotary furnace, so that the materialis delivered into the furnace and is fed gradually down it, formingl 7c a longitudinal accum ulation of cement material along the bottom and oneside ofthe fur,-`

uace, as is indicated in the drawings. The lower end or mouth of the'furnace'communicates with the exit or combustion chamber D, 7 5 formed of refractory material F and having suitable strengthening-plates, theplate F being onv the'voutside of the chamberdirectly opposite the mouth of the furnace. The material falls from the lower end ofthe furnace- 8o upon thechute H, from which it vpasses into the rotating cooling-cylinder H', substantially similar in construction to the rotary furnace and well known in this art. Secured to the strengthening-plate F' is the platform or sup- 85 rporting-shelf F4 forthe burners E Epwhich rproject through suitable openings F2 F3 in the side of the combustion-chamber opposite the mouth of the furnace. Suitable plates F7 may be employed to t closely'abo'ut the burner- 9o tubes and serve to close the openings through which these'tubes project into the combus tion-chamber, these-plates moving with the burner-tubes as'they are adj usted. Upon the supporting-shelf F4 are formed two frames F5 95 F6, each inclosing one of the burner-tubes, which at this point is preferably formed with a square extension E4 about the tube, which is engaged by four bolts F8, passing through the frame at right angles to each other'to, roo readily adjust the position of the front end of each of the burner-tubes. (See Fig. 2.) Y v- Pulverized carbonaceous fuel ,formed by pulverizing to an impalpable powder anthra cite or bituminous coal, or a mixture of the two, `is fed from the hopper G, where a supply of this material is always maintained, by the screw conveyer G3, which gradually feeds this material down into thevpassage G2, coin- 3 of the furnace, if desired.` -`The burner-tube /tubes to the pipe E in a flexible manner,

forming practically a ball-and-socket joint at this point. Any other connecting means may be employed, and since it is lonlynecessary to have a very slight feedom of movement of the burner-tubesthe ordinary slip-joint between the light sheet-metal pipes of which, the burners are "constructed is'usually sufficient `to allowl this movement. f ...l

In Figs. 4 and 5 I have indicated a moditied form of burner with a device for divert-v ing part of a jet of line fuel toward the' side u `Eihas adjustably attached to it by the setscrew K5 the 'sleeve K4, which may be-ad-` j'usted longitudinally of theb urner-tubeor j angularly-.with respect thereto. f ,i pound vdiverting-.plate K issrigidly secured to The comthis sleeve Iby the two. attaching-.pieces K3.

'lf-he diverting-plate K isjformed with one face K preferably extending substantially parallel with the axis of the burner-tube, and the other inclined face K2, which is intended to divert part of the jet of air and fine fuel issuingfrom the burner-tube away from the main portion of the jet, so that thisfpartof the jet may be inclined, if desired, toward the wall of the y furnace to act in a way in connect-ion therewith similar to the action of the inclined jet E2.

The operation of this apparatus is `asgfollows: The burner E is intended to produce a flame extending substantially parallel tothe axis of the rotating furnace, and the burner 'istherefore t-rained to produce this result.

The vburner-tube is substantially parallel toy the axis, as is shown in Fig. .2, and this burner is located a little to one side of the axis of the furnace. It will be apparent tothose skilled in the art that by this apparatus a continuous -uniform jet of air and tine fuel issues from .the burner E and enters the combustionchamber, where it meets an additional supply of heated air which has entered the ,combustion chamber after having passed up through the cenxent-cooling'cylinder and been heated therein. vThe jet after being properly ignited burns continuously in the hot furnace with a comparatively steady fiame, heating jet.

drawings, toward the adjacent furnace-Wall,` A con-v the walls of the furnace and the material fed through the furnace by radiation in a wellknown manner. The second jet of fine fuel issues from the burner E2 and burns within the furnace in a mannersimilar to the other This jet is inclined, as shown in the so that the outer envelops of this jet impinge slightly uponthe mass of clinker or cement material which is fed down along one side of the furnace, as indicated. This jet andthe envelops of intensely-heated gases surrounding this jet heat the adjacent cement ,material and the walls of the furnace at a pointcomparativel-y n'ear'thellower end of furnace to a much greater extent than they heat the other partsof the furnace, since the jet at this point has assumed an eccentric position with relation to the wallsof the fur-y nace, because the flame at this point is much nearer tov the side of.A the furnace. This maintains a hot zone near the' lower end .of the furnace'under all normal conditions of operation and insures Vthe correct'distribution of heatat the various parts ofthe furnace to secure the proper burning of the cement material. Y Y

It will Abe noted that bythe -means I have disclosedthe inclination of the jet vE2 may be varied, sothat there is a, greater or less local heating effect at the point desired by reason of the greater facility with which heat is su pplied to the furnace-walls atthis point, as the jet is directed nearer to these walls. It is .desirable in the ordinaryoperation of this apparatus to vary thedegree of inclinationfrom time to time to secure the Vbest results and also insonne caseswhen an yabnormal aggregation of cement material adheres to the furnace-lining at any point it isdesirable to direct the coal-jet so that, the heat therefrom .will have'a greater action .upon the furnacelining at this point to remove such accumulation of cement. I do not desire that there Ashall be-such direct impingement of the inclined jet upon "the furnace-'walls as will lburn out the walls of thefurnace inthe hot zone, since any very direct impingementof a coal-v jet-wllquickly destroy the furnace-lining. Whateverslight inipingement occurs should preferably takeplace upon that' part ofthe furnace that is protected e by the mass of clinker or cement material;.but even here any substantial impin gement of the particles carried upon the air-jet is in practice prevented by the strong draft -up the furnace, which tends to restore the inclined jet toward the axis of the furnace.

While I have shown theinclined coal-jet as operating :in connection with a jet which enters the furnace substantially parallel 4to the axis of the same and which impinges very little, if at all, upon its walls, I wish to be understood that a single coal vjet may' be employed, inclined toward the furnace-wall. It will be understood inl such'case' that the advantages which I have' set forth from the IIC IIS

.in this art.

slightly-inclined jet in heating vthe furnacewalls to produce a hot zone at the loWer part of the furnace and to insure the proper burning of the pulverized fuel and the proper distribution of heat at various parts of the furnace to burn cement in the correct manner is secured when only a single slightly-inclined jet is employed.

While I prefer to employ jets of air and fine fuel of uniform character and of low pressure, as I have disclosed, nevertheless, jets produced by a higher initial air-pressure and produced by different lapparatus maybe employed. Inv place of thev jet which I have shown as issuing from the burner E such a high-pressure compound jetas is shown in the Hurry and Seaman patent may belemployed. Such a jet may also be used in place of the slightly-inclined jet E2 either when the jet E2 is used in connection with the `jet E or when it is'used alone, as I have described. Other modifications may be made in the form, number, and arrangement of the jet or jets. Furthermore, any desired apparatus may be employed for producing jets of air and fine fuel and for introducing them into the. furnace.

The inclination of the jets or of any desired portion thereof may be accomplished instead of inclining the burner-tubefrom which a jet issues by the diverting-plate which I have shown in Figs. 4 and 5, Which serves to divert part of the jet, as has been explained, away from the body of the jet, so that this diverted part of the jet may be turned to- Ward the Walls of the furnace. Any other desired arrangement of diverting plate or plates may be employed, and these may be adjustably mounted upon the burner-tube to inoline a greater or less portion of the jets to- Ward the Walls of the furnace. Such diverting-plates may be employed, if desired, to divert an entire jet. Numerous other modifi,- cations of my apparatus and method of using the same might be employed by those skilled I do not, therefore, Wish to' be limited to the disclosure which I have made in this case g but what I wish to secure by Letters Patent is set forth in the appended claims.

What is claimed as new is-v-y 1. The process of feeding fine fuel into a rotary cement-furnace which consists in producing jets of air and fine fuel and in directing suchV jets into said furnace to assume an eccentric position in said furnace to produce a hot zone in said furnace by the eccentric position and by the proximity of such jets to the walls of said furnace.

2. The process of feeding tine fuel into a ro-l tary cementfnrnace which consists in producing jets of air and fine fuel and in directing such jets into said furnace to cause part of such jets to assume a position in proximity to the walls of said furnace to produce a hot zone in said furnace by the proximity of part of such jets to the Walls of said furnaces 3. The process of feeding line fuel into a rotarycement-furnace which consists in producing jets of air andline fuel, indirecting such jets into said furnace and in inclining part of such jets toward the Walls o f said furnace to produce a slight impingement thereupon.

4. The process of feeding tine fuel to a rotary cylindrical cement-furnace which consists in producing uniform jets'of air and fine fuel and in directing such jets into the rotary -furnace at an inclination to produce a hot zone in said furnace by the inclination of said jets toward the Walls of said furnace.

5. rljhe process of feeding line fuel into a rotary cement-furnace which consists in producing jets offine fuel, in feedi-ng such jets into said furnace substantially parallel to the axis thereof and in simultaneously inclining part of suchv jets toward the material'in said furnace to maintain a hot zone in said furnace.

-6. 4The process of feeding fine fuel into a rotary cylindrical cement-furnace which consists in producingjets lof air and tine fuel, in directing such jets into said furnace and in inclining part of such jets toward the Walls of said furnace.

- 7. The process of feedingflne fuel into acylindrical cement-furnace which consists in producingk uniform low-pressure jets of air and fine fuel, in directing one ofy such jets into said furnace substantially parallel to the axis thereof and in inclining another of such jets toward the Walls of said furnace.

8. The process of feeding fine fuel into a rotary cylindrical cement-furnace which consists in producing a jet of air and fine fuel and in directing such jet into said furnace to assume a position in' proximity to the Walls of said furnace to produce a hot zone in said furnace by the proximity of such jet to the IIO 10. The process of feeding fine fuel into a k rotary cylindrical cement-furnace which consists in producing a jet of air and ne fuel and in directing such jet into said furnace to ward the material in said furnace to slightly impinge upon the material treated in said `furnace to maintain a hot zone in said furnace.

11. The process of feeding fine fuel into a rotary cement-furnace which consists in proi ducing a jet of fine fuel and in directing such jet into said furnace toward the material in said furnace to slightlyimpinge upon the material treated in said furnace to maintain a hot zone in said furnace.

12. The process of feeding .fine fuel into a cement-furnace which consists in producing a jet of ne fuel and in directing such jet into said furnace to assume a position in proxim ity to the Walls of said furnace to produce a hot zone `in said furnace by the proximity of such jet to the walls of said furnace.

I3. The process of feeding fine fuel-into a rotary cement-furnace which consists in producing jets of fine fuel and in directingr such jets into said furnace to assume a position in proximity to the walls of said furnace to produce a hot zone in said furnace by the proximity of suchj ets to the walls of said furnace. 14. The process of feeding fine fuel into a rotary cement-furnace which consists in pro-Y such jets in said furnace.

V15. The process of feeding fine fuelinto va lrotary cement-furnace which consists in producing jets of air and fine fuel and in directing such jets into said furnace to assumev an eccentric position in said furnace to produce a hot zone in said furnace by the eccentric position of such jets in the hot `zone of said furnace. j

16. The process of feeding fine fuel into a rotary cement-furnace which consists in producing jets of fine fuel and in directing such jets into said furnace to cause the eccentric position of part of such jets nearone end of the furnace to produce a hot Zone in said furnace. 1

17. The lprocess of feeding fine fuel into a rotary cement-furnace which consists in producing a jet of fine fuel, in feeding such jet into said furnace to cause such jet to assume an eccentric position with relation to the Walls of the furnace'to produce ahot zone in said furnace. f v ROLL A- C. CARPENTER.

Witnesses:

G. B. PRESTON, FRED H. SMITH. 

